There are always interesting discoveries to be made when tearing down old equipment.
On the slab was a long defunked
Phillips PCL304 business laptop of 1991-1993 vintage. Leading edge in it's day, this business laptop had a black and white TFT screen, 2 meg of RAM, a 40 meg hard drive, a 3.5in floppy disc drive and a 20Mhz-386 CPU with a maths co-processor option. It ran DOS version 5 with a GUI file manager.
The battery inside the Dallas clock module had long died, so the Award Bios was stuck forever in January 1970. The battery pack for powering the machine was made from four chunky D-cell Nicads. There was also an pin header for an optional 300 baud modem, just in case the business user needed to dial the company mainframe from their hotel room. On the back were the standard printer and serial ports, with an expansion port for direct access to the bus. The PCB was a mixture of SMD and PTH parts, with chips being a mess of forms factors from DIP to PLCC and SOIC. In the picture the memory module is edge on in SIMM2 with, the power supply, battery charger and screen tube HT supply board, mounted over the hot CPU. The HDD and floppy are under the keyboard.
![Laptop Teardown - Mysterious signatures find? 867586-0](https://www.eevblog.com/forum/index.php?action=dlattach;topic=217364.0;attach=867588;image)
Now the interesting bit... The TFT screen lifted out to reveal embossed in the plastic case a whole set of signatures!
![Laptop Teardown - Mysterious signatures find? 867590-1](https://www.eevblog.com/forum/index.php?action=dlattach;topic=217364.0;attach=867592;image)
So, who were these people? Design engineers at Phillips?